Saxifrage Problem

I planted 40+ Saxifrage plants last year and they've spread to about 16 to 20 inches in diameter producing a fabulous display of flowers this spring. However I've lost 6 or more plants due them turning brown at the centre, spreading and eventually killing the plant. What's causing this ? and what can I do about it ?

Someone gave me a big pot with Saxifrage in it last year; the same thing happened to it and I think it was just too soggy. I didn't realise that the pot had weird 'raised' drainage holes, so there was always about 2 or3 cm of water in the base.

Mine does the same I planted 6 months ago it went brown in the centre and I put down to extreme wet weather we had here in rochdale,so moved it to a more sheltered area in my rockery bed I did what Lyn said and scratched as much of the brown as I could it grew back and is now just starting to flower